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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6077c289b24c630bca498bce4cca78042c7d93634f9876507b837c6b9185ea3' 
  AND token = 'K+D4FGFH66cljL82z5/5LiL2CTFP1p8U7rSfp1hNakM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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