Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cec275ee0baf1e8f2b28dba064704085d42fe3daf080ed54b539f47986ff3a' 
  AND token = 'W5oBIjBsn0ni8NXWoh0ZWiAaPRA/YdQsGeqy+dU00/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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