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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb67c00b733952e7932ac569d8a76f21587e7e83bd1eedd677bd76d6a00eda6' 
  AND token = 'eVbmjDt+xZViAknphvQeiD9JQiCx88yaNz9r9sV0BOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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