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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a423d178e3db36b65499e520dfefc51cac8027b9180a738c88b75837ddbce79' 
  AND token = 'MW+0EpgLMejpQxNp4f2b9K/U3Hd0AAtA8awWEBpifck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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