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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2320944c1059bed8f7caeadf0f0cf3f907c4d8d1cd52f456f6c1a7f4714b5e4' 
  AND token = 'W0HfvL0gI5z1CiW7s3RvVr63f8jrOf+ONGsM18LJM3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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