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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f831a4451f51e17cdd921100163d8a7588fb6e0f737e3f1999f48d6ed3e0bc' 
  AND token = '5bXO8MvimT3PcjRQMXkbYCTGZbOGmHbIBNP/CTdhTYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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