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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e228c6a9ef2f38be326fe5fc7d949c5ad65a50a15c53f0750a8aa71dd16b1c42' 
  AND token = '1qBYBlhP+ID1dt5wCFAZVxf7sanhyclIHqX1pjFmPf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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