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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c319ec00b86be463fdfc2abeee66e7d97f0d04f01835ad33826333a9a5603fe5' 
  AND token = 'iBWNHQGMtBRFS5oaatma+obcas5a7nWUl/2uY1gJKiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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