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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e67ff59e48ecec7a66b3b9642463f59111999f82a978a68aa92152a4a1b9b92' 
  AND token = 'Gq9Znplbq22Ttpz+Yq97eBQh6Z8wFV8M13D3wrxjv9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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