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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7268dd80f339ed3294cb541cf70ef9069c39f54aab5d8b5f9ede6348f28f9d8' 
  AND token = 'tdL6u+mwqJKsWf9YprrG0c2i+bpt029OG6rAqucRXew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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