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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bbf8dbb83e09272c9ce0fd05fbda1b0917db68930c8f1c5b830568aea5f24d' 
  AND token = '2ovKdy2IOUmsQUbOKG6TJbPKkAsHAyRGYY5r6V5Twfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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