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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65229763dbdae750731c5ea7a5d3afed0f613337dc49c8096c9758b23f3c21f' 
  AND token = 'UmrGuSkXb/7p6tb3DUk6DLJEZsNsbAQhsCZ8al3b9I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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