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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871631642027882408a4b96570c10795c0f38b9802fc583f884f74a9f3ae40f5' 
  AND token = 'W0a0LbtCb5zukmiqtd3VIwVPsjGjSJHtVk1F4hkXcqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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