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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8df33e1fe5e89877eae480b4c7fc47566336165cdcb200f8afa4add4f41912f' 
  AND token = 'dgkYiQ4pb0vO5F9hxYSrb5wTvBXcNNhjLGzfhKrtj8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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