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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7da0c1475e224e425c221bf7c3a0c4d699da73b4d6ccc81dff9a0c4f9da911' 
  AND token = '3dxU+6UCudU1GDrW/cKc6u0TfUjHkpo+3jV8mOv99Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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