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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0217f8fd2ab61ae2585cb5b7a26a406beb31cebe7b97c4ad50d4660e1f1e99b' 
  AND token = '+dDIHxQZLvjI0XK+K7sAMqdpjXon2FmMRaX8f79dD70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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