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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8741f4728f11bb53d56be7607f0e8536ccc2032901f0046e0bbf67eddc8661' 
  AND token = 'rAi8hHhmhHewnvl949wO6Xk3xjr9S1HcoUGwJcC5sto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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