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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a77b23bbac44eea033f4cb10a837a550ff1dbae1a9805bf12aea86609e1823' 
  AND token = '/11sITJxVqaaBMg7kObg5hWdy0goVAgVvFU2zs8SWIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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