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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f3b9c2f2f2c7db0909ce7d68528870e46563a2449050bd00ae84fe5f22def3' 
  AND token = '6aNXoe+XG+E1v7BNjy6/0G1LlHgl6uVLVynF0j83oKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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