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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba6c945de075dd57fbc8e3bf48fc401ed912c09e680d8fe778fe4da9ee5a848' 
  AND token = 'c7pSPwMRZiXBfVDMaEdJ5t4a/vk9tN0M75wmU8kWPvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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