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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cabc75aaacfe426c8f1df8a46ac695f493a10731c93d40db808fbbed8461de2' 
  AND token = 'T07uZK9XlTwGr6gEWQa9PmW5Uos3WSQJNypxhKGpc28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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