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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5727816e07ba3600992c041f47e70b22f4c2fbf42330cc05635d20397a377fc0' 
  AND token = 'WDSYtgjUH+RN9KDIE23CZrmK7Z4uEGNMYMuMmJBg9pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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