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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918a5403afd265921450d9ea2e531e3b437443d75767f982070074fadfefac4c' 
  AND token = '1AK3v9U2LwCD8Ozre3erecbO6I5R9Dua6chajT2jmaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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