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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81e90f29ecfa65cb8ee3473f5db22bb876a871c6b9dbc09bc1c20db86dc2495' 
  AND token = 'GOn7H2BC+mmms/Y866q2hJPle6UQ2xC83MvmuZbtcbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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