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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63456d8a938cbd2c7c293514cf03b91d3fdcf088c9b7bbec567326e12aac9ce9' 
  AND token = 'QQtPck8//Jd/8TrVWrlvejvkkcpu9timJ71LJxE4tKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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