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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31933ce6221736e8992662dadf1189cf33759b29c5d474663897af341cbc05c3' 
  AND token = '8lt7uZ+zQ7kLn8tSlwO5katdC1TZ2TewSOL0cdFs9m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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