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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2bf7ea9f710c33fcd44a8883f6afc1077e0bd2061fc34d58656760035ac5c' 
  AND token = 'E4iwKN5E8jC3wXgojTu7KOa4NLnevVbrxQgtiTry3bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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