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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98303853b8571d265a5be93f8d150ffccbbabc8e3024fbc556d68a84766a5d30' 
  AND token = '608iyC59/6KeLZj0Ow4cRWTgsy/hN7r9rf26LWmauCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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