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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3547dd912fe80ab2f0445393de77dddde7b94e59826ff65d47be71f76cb8f89' 
  AND token = 'TmKvGW0SGwGsBn+fkSTmeRLIXGQHcpytRH9dAuv2LVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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