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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050730704b5b83f19706c4a7af33398de3b963acbea2a47f6b2b08646c210c57' 
  AND token = 'f6FxxEmU9aD0A0FNBHF8VoTesvVIp+h6tJsmAS/HGPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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