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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df3fd00e68d85cfc92b9eaad6efe25c8efbcbb64c4dac3c887c3e6e0bf8e6f6' 
  AND token = '7CzCB3a57sxqW3LIF6M5kj8SaJFvqqt2UCwlmKxPwHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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