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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80babb9631fb78feab469b1fcae8efb9648d07c6500803942ff74d22e43d6b9f' 
  AND token = 'FZ1IYx3mze2SRZepa5zKfF3ozLZ5HR9Tmvv2qwqF7d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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