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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd074a09a90c1e7672d67590ae94d11b9f35c7f2712d38ab2fca2e648acc03db' 
  AND token = 'xX1VKQYAgeDi3pLv5wbWW3A6Mg6vyh4oNTA8WskWogA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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