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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946e486d29efd08c5ee55e8c6a617d5734e9d5398079a21b5881685324225dac' 
  AND token = 'g7d0YcSt0PH5OjOoWs9asve/sTGf2UeBVElbBK+hi8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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