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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bad659038b39bbd25845a01d4bb12f30081c9b10ba2dad1ac3de0ab1bb7940b' 
  AND token = 'cqvqnw7XMJs5Jwras8VF3uYCScPfu6J7mOFxbksU5FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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