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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6608f6209b82f458fd7b37eb0e8fcda17e09929efa44dccbf9f646dd9eb713d7' 
  AND token = 'cR76K8xs2pYI38XVRUHOkw4eqlXmoKMmfi+TT9QBbhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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