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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05db2ca73fa366781e2b509e879af5c239cf266e1aca05e285b7811d01d1379' 
  AND token = 'M/jjX3EKmkvO+z/OlvjENAYESxNSlzBSfr9tTAjSL34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}