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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78df98ef97cc8b692f6d29394fd583655704f6a9fc9f0a888964733b0957491a' 
  AND token = 'hZSV9b7UST6zWcre601/Y7NCYs1A7FySk50+Btieqak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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