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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42eabd8316c5ee0a385660d8484b13962da4bf99181e550406c94dd1708d2ffd' 
  AND token = 'LVMmTX84D3W3wGZ8TfbQ9cwRxWpKM8YRiZ/AEtC+R1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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