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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440df314b8ce43756c43a08d2055a7fc8ba9edd5aab8b062a2975e645b06bfa4' 
  AND token = 'LRhzSMco07Ki5IsedOHjeDxHDCVAqI3L3qqa5liwvr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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