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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacb3ad38f2791b9132c1af6fc0f5061fad6cead432ebedf6c1ebc7cf72b9aa5' 
  AND token = 'bzhGd7Doi3g0zpsh6BR8Vpa5RvNoyW7fbGOgaSCMklA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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