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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32469832eebad134305f851afe5811d57bf39a09f62950f4cbe587a0cdcd493a' 
  AND token = 'vbk11YU7uwjKdjS68M9ZXLT+b8B0ltHPAojN36iY13c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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