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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6410e3b9f130f7d6fb2d8978b31ee6a7c90cec2d91b55d10de181fd8275c7d' 
  AND token = 'dwzD39fcq3FRsgv3z1N92Pqga9gCJGbckPt9diOEo5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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