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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f08355b380d993e8b068076542f10a25b670d36e9efe041ec2fc69f49cfc4c0' 
  AND token = 'gueugLNIrvpU1t4/csMo4E5JCNuoG2Z00T860bWplkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}