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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62baa72fa9c613e7d6712234b20f8b8d83678040fc77b33c30572e2e55a3d2d8' 
  AND token = '+Ge/d4sSDYe3o2vmOpqKTFNEyz3Zehw8IxnCZEFjV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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