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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914dd80554f577deec8da889b873c08a31c72f411381dbc981c00ef8ef1403e0' 
  AND token = 'ptgyF95C5afRDfigPfV5YN7p6+H4u5I6y23Q1qFjmlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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