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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23af36faad53216c57009561ece9f4ace838ef6bca4d45ecc95c6da40b70cb7f' 
  AND token = '5PRuJxH8vCPpTc5vSeZFqg4K+f8Ve5aoEyuHcPrrZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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