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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9d871e2e293dc59c620bfb3c39623c44a4dd4343624f53befa659167cb922d' 
  AND token = 'UOYxkyP90rdZQnjjumCayUnjvX5vZxrB5Hu7ViN2sN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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