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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb59350414d9c5097c25fc9db0fc830b462022e14898b6aa44e38eeebd705c24' 
  AND token = 'Ozvnzi83znH8Yg2NFwe2gae6KjVKX1f78VaE9YLstkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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