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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208434792ceb5c8fbff3944a7c83f83c60b5f3a41e3952d509659ca2f209541e' 
  AND token = 'y+2rV9yH4yVGGGB8aesbaDuICAcKHr5gvcHDhFcbsAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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