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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5de068bd78292bd9cf9663fa9ba2613cd676318dbd5025a07c51881cce2d805' 
  AND token = 'gCJ7hSBQIc2yJN5tkU5j2NWDlgzmNWpc07hnGGY/DXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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