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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dafcaca8025dcd9d14e98f9c82c15c8a1a62be8a8838e73f8457857322a983' 
  AND token = 'gM/Cwf5ojv60bTu3/toU9+e0z8A2NhN3E8uz/NXDwjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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