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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f8bce7208098318e227b92b0fca22c036a80a9fe98b6e4255e4f7a23d870f9' 
  AND token = 'BEvG4joCN0Jf2bEkn5C0aDcZxqOthFlNnZL1d0+mhUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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