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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e053ce4b8ba5e64c85ae633dcb7204de975996693a98c73f1f033370054937' 
  AND token = 'xu51pexNCbPdu+SRAoO9+UosOg5r93+QjzovILkO+WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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