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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73bfb438e153f9c0369d2de90ca19799d6ef87fd028efcdb335253dc1e2c1ae' 
  AND token = 'u6rib7k3wuqvVSDBjexVro8dUtr191UeJ2wPCpcLXqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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