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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a9d30f4e0c971f9029bc76fd50b70c44d712669b03077180dcbad9af756597' 
  AND token = '2JBCWNGyhnxrdbShryjLtcYv+nZOyRpM2uv2QD1Ts/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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