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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4cf6b404945b56ae00e6831f3f867a61288da958e76166aca3fae3113d009a' 
  AND token = '6QqwsJpdCWTPGE6S2m8lmSruo0U664bBsjily7VnT1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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