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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d29ddaddf88791349802eb8a76cbb90ca72311d27344c414c576858d76784b2' 
  AND token = 'Na/xhsRw4q9qbLY4MFhm4j7Z/37iS5iXdj7TqTFjsEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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