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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81dee23502dcc454a91b0b688dd7d2b63f9a56aa949236598e0a1068f936105c' 
  AND token = 'ujtKMSsGPvIeegyXW7aMvEU7/w1J3JYLhUTUnekJgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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