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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711a207214cbeeb5df67d8ea3d3e9f4f49d64d093627867f924b8c33c1b6150a' 
  AND token = 'WvKkRjklUXqb6bfgRMQgbzZ9iUWRxjXf8yhC5klaOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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