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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e0495353b9146f6f88c9d293be69a96e94160d934b73d5ef15809bfc0b84c' 
  AND token = 'KF5Di4toktUegg7OdkOGPevR5HFm2XzeRLbE+Th3W18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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