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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c828270b6ce69592f801d0fbef7f038a3aba246837a823f9fc8117442a6bdc5' 
  AND token = '3nAoxQsWY5MiHAwXS63oeJ9ddshFGouDrefz9ViU584=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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