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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990f2f8791c3b8ab93506cf1f2b904ac310e1b06479db9297594e4d26597ec81' 
  AND token = 'q9yxZxP7+W5/7k/xIVJ+rTZPWd9UdWfxaHptDU83t90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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