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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079e56f3b899ce9d95955f1810a328d15b92b7026850cd9d6f9acb6c6b693a8e' 
  AND token = 'HfwbsScAPxPsfCYgzUlTBPsdu8SszDiM2zug/NmW04w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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