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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c09ece7f75c70a20bd2ebb2a3836bea0a55ae0359538068028ce87da55176f' 
  AND token = 'W5+Z9vav5XmtLov9o/62XAK6U2CdsoaNw3fhPSe1xeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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