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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf747be0f7d4012f7dbecd44522ad36f489b2f0b76b0b2089d1d389d2b1b6c6' 
  AND token = 'DzfXvitakiw8TqsTgw6iTs0R6b+shkY9WUwliQ+U1Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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